diff options
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 127 | ||||
| -rw-r--r-- | include/linux/pci.h | 1 |
2 files changed, 128 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index fbbb97f28259..74508c63bd47 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -404,6 +404,106 @@ static ssize_t d3cold_allowed_show(struct device *dev, } #endif +#ifdef CONFIG_PCI_IOV +static ssize_t sriov_totalvfs_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return sprintf(buf, "%u\n", pdev->sriov->total); +} + + +static ssize_t sriov_numvfs_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return sprintf(buf, "%u\n", pdev->sriov->nr_virtfn); +} + +/* + * num_vfs > 0; number of vfs to enable + * num_vfs = 0; disable all vfs + * + * Note: SRIOV spec doesn't allow partial VF + * disable, so its all or none. + */ +static ssize_t sriov_numvfs_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + int num_vfs_enabled = 0; + int num_vfs; + int ret = 0; + u16 total; + + if (kstrtoint(buf, 0, &num_vfs) < 0) + return -EINVAL; + + /* is PF driver loaded w/callback */ + if (!pdev->driver || !pdev->driver->sriov_configure) { + dev_info(&pdev->dev, + "Driver doesn't support SRIOV configuration via sysfs\n"); + return -ENOSYS; + } + + /* if enabling vf's ... */ + total = pdev->sriov->total; + /* Requested VFs to enable < totalvfs and none enabled already */ + if ((num_vfs > 0) && (num_vfs <= total)) { + if (pdev->sriov->nr_virtfn == 0) { + num_vfs_enabled = + pdev->driver->sriov_configure(pdev, num_vfs); + if ((num_vfs_enabled >= 0) && + (num_vfs_enabled != num_vfs)) { + dev_warn(&pdev->dev, + "Only %d VFs enabled\n", + num_vfs_enabled); + return count; + } else if (num_vfs_enabled < 0) + /* error code from driver callback */ + return num_vfs_enabled; + } else if (num_vfs == pdev->sriov->nr_virtfn) { + dev_warn(&pdev->dev, + "%d VFs already enabled; no enable action taken\n", + num_vfs); + return count; + } else { + dev_warn(&pdev->dev, + "%d VFs already enabled. Disable before enabling %d VFs\n", + pdev->sriov->nr_virtfn, num_vfs); + return -EINVAL; + } + } + + /* disable vfs */ + if (num_vfs == 0) { + if (pdev->sriov->nr_virtfn != 0) { + ret = pdev->driver->sriov_configure(pdev, 0); + return ret ? ret : count; + } else { + dev_warn(&pdev->dev, + "All VFs disabled; no disable action taken\n"); + return count; + } + } + + dev_err(&pdev->dev, + "Invalid value for number of VFs to enable: %d\n", num_vfs); + + return -EINVAL; +} + +static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs); +static struct device_attribute sriov_numvfs_attr = + __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP), + sriov_numvfs_show, sriov_numvfs_store); +#endif /* CONFIG_PCI_IOV */ + struct device_attribute pci_dev_attrs[] = { __ATTR_RO(resource), __ATTR_RO(vendor), @@ -1421,6 +1521,30 @@ static umode_t pci_dev_attrs_are_visible(struct kobject *kobj, return a->mode; } +#ifdef CONFIG_PCI_IOV +static struct attribute *sriov_dev_attrs[] = { + &sriov_totalvfs_attr.attr, + &sriov_numvfs_attr.attr, + NULL, +}; + +static umode_t sriov_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + + if (!dev_is_pf(dev)) + return 0; + + return a->mode; +} + +static struct attribute_group sriov_dev_attr_group = { + .attrs = sriov_dev_attrs, + .is_visible = sriov_attrs_are_visible, +}; +#endif /* CONFIG_PCI_IOV */ + static struct attribute_group pci_dev_attr_group = { .attrs = pci_dev_dev_attrs, .is_visible = pci_dev_attrs_are_visible, @@ -1428,6 +1552,9 @@ static struct attribute_group pci_dev_attr_group = { static const struct attribute_group *pci_dev_attr_groups[] = { &pci_dev_attr_group, +#ifdef CONFIG_PCI_IOV + &sriov_dev_attr_group, +#endif NULL, }; diff --git a/include/linux/pci.h b/include/linux/pci.h index ee2179546c63..7ef8fba319da 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -573,6 +573,7 @@ struct pci_driver { int (*resume_early) (struct pci_dev *dev); int (*resume) (struct pci_dev *dev); /* Device woken up */ void (*shutdown) (struct pci_dev *dev); + int (*sriov_configure) (struct pci_dev *dev, int num_vfs); /* PF pdev */ const struct pci_error_handlers *err_handler; struct device_driver driver; struct pci_dynids dynids; |